refractor(build): move prepare tasks to the prepare sub package.

pkg/prebuild/prepare/core.go

@@ -0,0 +1,39 @@
+// apparmor.d - Full set of apparmor profiles
+// Copyright (C) 2021-2024 Alexandre Pujol <alexandre@pujol.io>
+// SPDX-License-Identifier: GPL-2.0-only
+
+package prepare
+
+import (
+	"fmt"
+
+	"github.com/roddhjav/apparmor.d/pkg/prebuild/cfg"
+)
+
+var (
+	// Prepare the build directory with the following tasks
+	Prepares = []Task{}
+
+	// Available prepare tasks
+	Tasks = map[string]Task{}
+)
+
+// Main directive interface
+type Task interface {
+	cfg.BaseInterface
+	Apply() ([]string, error)
+}
+
+func Register(names ...string) {
+	for _, name := range names {
+		if b, present := Tasks[name]; present {
+			Prepares = append(Prepares, b)
+		} else {
+			panic(fmt.Sprintf("Unknown task: %s", name))
+		}
+	}
+}
+
+func RegisterTask(t Task) {
+	Tasks[t.Name()] = t
+}